Multiplex communications – Wide area network – Packet switching
Patent
1987-12-24
1990-01-02
Goldstein, Herbert
Multiplex communications
Wide area network
Packet switching
307242, 328104, H04J 304
Patent
active
048918083
ABSTRACT:
A time division multiplexer is operable to sample data on parallel input channels at a sampling rate at least twice the data rate, to serially transmit the data for each channel in a respective time division, and to recover the data at a receive end. The multiplexer is provided with a bit storage register for successive samples on at least one input channel to be used as a marker channel. Gating connected to the bit storage register forces a detectable unnatural data pattern on the transmitted data for that channel whenever a predetermined bit pattern is stored for that channel. According to one embodiment, when a plurality of unchanged levels (e.g., binary one) appear in the bit storage register, a central bit is inverted to thereby mark that channel. The inverted marker bit is detected and cancelled at the receive end and/or is used to reset the channel counter if detected on a channel other than the marker channel.
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Coherent Communication Systems Corp.
Goldstein Herbert
Scutch III Frank M.
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